There are many times that I found myself with anger arisen over a particular unwanted thing happening. I guess the body has some energy that needs to be released and it is often very unskillful. With a little bit of wisdom, I can see the anger, but I notice my ego will quickly find a new angle to access a different emotion all based on the original incident. Feeling like an unlocked backdoor, it is at first... enticing. At least now after seeing this happen again and again, my awareness is slowly stopping these forays into sideline emotions. I am now trying to ease the original displeasure with noting what is happening and with the awareness of breath and where it might take me... which is always away from peace. This might help— with a monkey mind you can flip between now and future outcome (i.e. often more trouble than the original complaint). I can usually access humor when I repeat to myself, Pick an emotion, and just run with it. Seeing it spinning out of control, trying to hold tight to your original emotion and how fast it can move quickly in the opposite direction of peace. At times, I have to beeline to the cushion, to just sit and observe... if at home. I certainly do not carry a cushion with the words embroidered on it, In Case of Anger, but at least this will give you all some idea of my intention.
I know intellectually why anger can be easily accessed for me, but outlining why would only put this further from your own experiences. It can be used with sadness and depression, if this is what you have frequent flier miles in. Those two often appear when one has anger towards yourself. Whatever emotion, just watch what you are doing, even if you can’t stop it immediately… the awareness of how much further you cast peace out of your range will be enlightening.